Update "Bookmark Sync" string in options dialog.
Update "Bookmark Sync" string in options dialog.

This should be sentence-case rather than title-case for non-Linux,
and it shouldn't have a trailing colon on Linux.

BUG=27766

Review URL: http://codereview.chromium.org/395019

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@32073 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser